Electrical-impulse-transmitting device.



J. ERIGKSON.

ELECTRICAL IMPULSE TRANSMITTING DEVICE.

APPLICATION FILED AUG. 20, 1906. RENEWED OCT. 14, 1908.

909,383. Patented Jan. 12, 1909.

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" I Aifiowwegei J. ERIGKSON. ELECTRICAL IMPULSE TRANSMITTING DEVICE. APPLIGATION PIL'ED AUG'. 2'0, i906. RENEWED OCT. 14, 190B.

909,388 I Patented Jan. 12,1909.

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J. ERIGKSON.

ELECTRICAL IMPULSE TRANSMITTING DEVICE. APPLICATION FILED AUG. 20, 1900. RENEWED 00'1. 14, 1909.

909,383. Patented Jan. 12, 1909.

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JOHN Emerson, or CHICAGO, ILLINOIS, hSSIGNOR, BY MESNE ASSIGNMENTS, 'ro FIRST .rausr AND SAVINGS BANK, TRUSTEE, or onIoAeo, ILLINOIS.

ELECTRICAL-MPULSE-TRANSMXTTINQ DEVIEUE.

Specification of Letters Patent. v

Patented Jan. 12, 1909 Application filed August 20, 1906, Serial No. 331,302. Renewed. October 14:, 1908. Serial No. &57,751.

To all whom it may concern:

Be it known that 1, JOHN ERIoKsoN, a citizen of the United States of America, and resident of Chicago, Cook county, Illinois, have invented a certain new and useful Improvement in vElectrical-Impulse-'lrans- Initting Devices, of which the following is a specification.

My invention contemplates a dev1ce of,

the character and for the same general purpose as that described in my copending application Serial No. 331,304:, filed August 20th, 1906. This application is, therefore, subordinate to said other application.

My present invention contemplates a device for preventing the rotatable dial or.

apertnred disk of a subscribers automatic telephone from being manually forced back to its normal position, and of a different form from that disclosed in my said other application.

My present invention, as herein disclosed, contemplates a device for po itively locking the dial against back rotation as soon as it reaches the limit of its forward rotation, making it necessary to release the dial in order to unlock the same. The dial cannot move at all until the calling subscriber lets go of the same, as will hereinafter more fully appear.

In the accompanying drawings Figure I" is a front elevation of a subscribers automatic telephone having a rotatable dial or calling disk embodying the principles of my invention, certain portions thereof being broken away for convenience of illustration. Fig. 2 shows the mechanism of the dial and front of the casing removed. F lg. 3 is a rear elevation of the mechanism. Fig. 4 is a sectional view showing the toothed wheel or member by which the springs are pressed for transmitting the impulses. Figs. 5 to 10, inclusive, show different positions of the springs and thesaid toothed Wheel, and show how the impulses are transmitted, in the well-known manner. 1

As thus illustrated the dial A is of the usual and well known form, being positioned at the'front of the telephone casing B. The shaft or arbor C supports the said dial and operates the impulse-transmitting mechanism within the telephone casing. It

ployed for returning the .dial to its normal position. ,This dial is apertured near its outer edge,,as shown, so as to enable the known manner. ably ten in number, whereby the subscriber may partially rotate the disk or dial in accordance with each digit of any-called telephone number. Within the telephone case ing there is a ring or circular flange D which is suitably connected with the shaft or arbor C, or directly with the said rotatable dial or disk A. This ring or circular flange D is provided with peripheral apertures 0Z, there being. one aperture for each opening in the dial or disk, as indicated in To the under side and a little to the left of the telephone casing is an inclosure E containing a pivot stop F, which latter is of the usual and well-known character, except for the fact that it has its lower end pivoted at f and provided with an arm F. A locking arm G is also pivoted at f and provided with an end portion 9 adapted to. rise up back of the dial end engage any one 'hf the apertures (Z in the circular flange D. It will be understood that spring means are provided for connecting the stop F with the arm G, whereby the two are capable of relative movement, the spring being so applied that it tends to keep the two normally in the position shown in Fig. 1. A spring H is secured to the inclosure E and adapted to bear upon the arm f, thus keeping the upper end of the arm G in its normal or resting position upon the pin g. The dial is rotated 1n the usual and well-known manner by insertinga finger in one of the openings a, and its forward rotation is limited by the striking of the finger against the stop F, the movement continuinguntil this stop is in the position indicated by dotted lines in Fig. 1. When the movement of the dial is thus arrested, it will be seen that the end portion g of the arm is thereby thrown into engagement with one of the apertures d, thus ositively locking'the dial against rotation In either directionthat is to say, so long as the finger continues to hold the stop F in its upright position. As soon as the calling subscriber releases stop F then snaps back into its normal po subscriber to rotate it in the usual and well I Said apertures are preferthe dial, .however, the 1105 sition,'causing the arm Gto also assume its normal position, thus releasing the dial and allowing its spring to carry it back to normal position. It will be understood, of course, that it is duringthis back rotation of the dial that the electrical impulses are transmitted over the subscribers line for the purpose of performing the desired switching operation at the exchange or central station. This, however, is all fully-set forth in my "application above referred to, and is a thing well understootnl. With this arrangementrthedial canno be forced back to its normal position, as it remains locked against movement as long as the subscriber retains his finger in engagement with the opening in the dial. In other words, while the finger is still .in engagement with the opening in the dial the mention of the latter cannot be reversed, for the 1 reason that considerable backward movement is necessary on the part of the stop F in order to carry the end portion 9 out of engagement with the aperture (1! in the flange D, and before the dial is thus unlocked. With this construction the calling subscriber will be reminded of the proper way in which the dial. must be 0 erated should he attempt to force the dial ack to its normal, position instead of releasing it and allowing it to travel back in the right imannelx He will then, of course, instantly removediis finger from the opening in the dial, and thus permit theimpulse-transmitting operation to proceed in' the desired manner. -Without this arrangement, and as explained in my said other applicatiommore or less trouble might result from a forcing or accelerating of-the back rotation of the dial.

. Figs. 2 to 10, inclusive, illustrate the wellknown formof subscribers calling mechanism, in connection with whichI have elected to describemy invention. Referringto Fig.

4, it will beseen that the impulse wheel I is mounted onv the shaft C, and isadapted to operate the impulse springs J and Krelatively. to the ground post L, in the wellknown manner. Referring to 2 it will be seen that the spring M operates like a clock spring, and serves to give the impulse Wheel and--dial a backward rotation. As this mechanism forms no part of my present invention, no further description is neces f sarv.

the dial has an additional aperture for long distance callin It will be see n that the dial lock or retarding device is operative to oppose or prevent forcing or undue acceleration of the dial, but is inoperative to oppose or retard the propelling'power of the spring by which the impulse wheel and dial are returned to their normal positions. Furthermore, it will be seen that the dial lock thus'provided is adapted to unlock the dial as soon as the latter 'i'sgeleased by the snbscriberthat is to say, assoon as the subscriber withdraws his hand from the dial. In this way the lock does not hold the dial and impulse wheel against rotation for any time whatever after the subscriber lets go of the dial.' Furthermore, it will be seen that the locking of the dial is accomplished by the pressure of the finger as the dial approaches the end of its forward rotation, the dial being unlocked as soon as the finger is withdrawn from the hole in the dial.

What I claim as my-invention is 1. In automatic telephony, the combination of a rotatable calling dial, spring means for rotating the dial back to-its normal position, a stop-for limiting the forward rotation of the dial, and a locking'device for locking the dial against back rotation as soon as the said stop is engaged by the calling subscriberts finger.

2. In automatic telephony, the combination-of a rotatable calling dial, spring means for returning the dial to its normal position, meansfor limiting the forward rotation of the dial, and automatic meansfon positively locking the dial 'against back -rot'ation as soon asit reaches the limit of its forward rotation.

3. In automatic telephony, a rotatable calling dial provided with means for restoring it to normal position, and provided also with automatic means for positively locking it against. back rotation after reaching the limit of it's forward rotation, adapted to releases the same. r

y 4. In automatic telephony, the combina tion of a rotatable calling dial, a pivoted sto for limiting the forward rotation of the dia an apertured flange rotatable with the dial, a locking arm adapted'to engage the apertures in said flange, means by which the locking arm is operated by the said stop, and

spring means for holding the stop and looking arm in their normal positions, for the purpose set forth.

5. In automatic telephony, the combination of a rotatable apertured calling dial, a

pivoted finger stop for limiting the forward rotation of the dial, and means operated by the said stop for positively locking the dial against bacwation.

no release the dial as soon as the subscriber end of its forward rotation, but adapted to the same against backward rotation, but 10 adapted to'unlock the dial as soon as the subscriber releases the same.

Signed by ineg'at Chicago, Cook county, Illinois, this 17th day of August, 1906.

JOHN ERICKSON.

6. In a telebhone system, a calling dial, and means operated by engagement with the subscribers hand for lockmg the dial at the unlock the dial as soon as the subscriber releases the same.

7. In a telephone system, a rotatable call- Witnesses: ing dial, means automatically operated in EDWARD D. Runs, the forward rotation of the dial for looking I BERNARD 'D. WILLIS. 

